Patents by Inventor Alfonso L. Baldi
Alfonso L. Baldi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 4897375Abstract: Self-supporting web of brass or similar cupreous metal is catalytically activated by diffusing aluminum into its surface at low temperatures and then leaching out some of that aluminum with dilute mineral acid, preferably HNO.sub.3, or ammonium persulfate. Resulting catalyst is very effective for reaction of CO with H.sub.2 to make methanol, and web provides very good thermal conductivity for improved temperature control. Activation can be confined to one face of web. Other self-supporting catalysts can be made similarly.Type: GrantFiled: March 28, 1983Date of Patent: January 30, 1990Assignee: Alloy Surfaces Company, Inc.Inventor: Alfonso L. Baldi
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Patent number: 4895609Abstract: Metals are made pyrophoric by diffusing aluminum or zinc into them and then leaching it out, or by reacting with aluminum and then leaching aluminum out. Powdered aluminum and powdered nickel, iron or cobalt, can thus be carried on an elongated support web and reacted by heating for a few seconds to a few minutes, after which leaching will provide elongated pyrophoric foil suitable for decoying heat-seeking missile.Type: GrantFiled: June 10, 1988Date of Patent: January 23, 1990Assignee: Alloy Surfaces Company, Inc.Inventor: Alfonso L. Baldi
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Patent number: 4880483Abstract: Very good masking of pack diffusion aluminizing or chromizing on any metal to keep portions from being diffusion coated is effected by localized coating of masking powder, the metal portion of which can have some composition as substrates. Chromizing can be performed before aluminizing for greater effects. Aluminizing of metals like iron and nickel followed by leaching out much of the diffused-in aluminum gives these substrates a pyrophoric and catalytic surface. Foil, wire or powder can be thus activated; very fine activated powder when discharged into the air forms a warm cloud that settles very slowly and decoys heat-seeking missiles.Type: GrantFiled: September 11, 1987Date of Patent: November 14, 1989Assignee: Alloy Surfaces Company, Inc.Inventor: Alfonso L. Baldi
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Patent number: 4871708Abstract: Plain iron and nickel can be activated to become extremely pyrophoric and can have their pyrophoric action improved by short dip in acid solution having ph about 2 to about 4. Foils of such metals so treated can be folded to further increase pyrophoric action.Type: GrantFiled: May 13, 1986Date of Patent: October 3, 1989Assignee: Alloy Surfaces Company, Inc.Inventor: Alfonso L. Baldi
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Patent number: 4845139Abstract: Very good masking of pack diffusion aluminizing on any metal to keep portions from being diffusion coated, is effected by localized coating layers the lowest of which is inert or depletion-reducing masking powder that can have same composition as substrates, mixed with non-contaminating film-former such as acrylic resin. The upper coating layer or layers can be of non-contaminating particles like nickel or Cr.sub.2 O.sub.3 that upon aluminizing or chromizing become coherently held together to form a secure sheath. Such sheath can also be used for holding localized diffusion-coating layer in place. Film-former can be dissolved in volatile solvent, preferably methyl chloroform, in which masking powder or sheath-forming powder is suspended. Chromizing can be performed before aluminizing for greater effects.Type: GrantFiled: February 28, 1984Date of Patent: July 4, 1989Assignee: Alloy Surfaces Company, Inc.Inventor: Alfonso L. Baldi
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Patent number: 4830931Abstract: Diffusion aluminizing with chromium or silver chloride, bromide or iodide that is not significantly soluble in or reactive with water. Hydrogen can be excluded from diffusion aluminizing atmosphere when aluminizing maraging steels or other substrates sensitive to hydrogen. Aluminized iron powders can be boronized to increase their exothermic heat upon exposure to air after leaching out aluminum.Type: GrantFiled: October 3, 1983Date of Patent: May 16, 1989Assignee: Alloy Surfaces Company, Inc.Inventor: Alfonso L. Baldi
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Patent number: 4824482Abstract: Diffusion aluminizing, when applied to titanium is effected with little or no activator to produce more uniform case and less etching.Workpieces are very rapidly pack-diffusion coated by using an excess of energizers in the pack, heating the retort containing the packed workpieces at a rate that brings the workpieces to diffusion-coating temperature and then completing the diffusion coating, all in less than 50 minutes, then cooling the retort.Diffusion aluminizing can also be applied to foils and powder to make pyrophoric product after leaching out much of the introduced aluminum. Powder can also be diffusion boronized. Pyrophoric boron-containing iron or nickel powder mixed with Ba(NO.sub.3).sub.2 will ignite to cause generation of large quantity of NO.sub.2 gas, and generation is improved when powdered boron and/or an oxidizer like NaClO.sub.3 is added.Type: GrantFiled: March 4, 1985Date of Patent: April 25, 1989Assignee: Alloy Surfaces Company, Inc.Inventor: Alfonso L. Baldi
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Patent number: 4820362Abstract: Low alloy steel tubes are decarburized, heavily diffusion chromized and heavily diffusion aluminized to protect them against sulfidation. For the diffusion they can be supported upright with one end on layer of diffusion-coating pack on floor of a retort. Surface portions that are to be welded are covered with masking layer that prevents diffusion coating, or with inert layer that reduces the amount of coating. Diffusion aluminizing can also be applied to foils and powder to make pyrophoric product after leaching out much of the introduced aluminum. Powder can also be diffusion boronized. Pyrophoric boron-containing iron or nickel powder mixed with Ba(NO.sub.3).sub.2 will ignite to cause generation of large quantity of NO.sub.2 gas, and generation is improved when powdered boron and/or oxidizer like NaClO.sub.3 is added.Type: GrantFiled: December 27, 1984Date of Patent: April 11, 1989Assignee: Alloy Surfaces Company, Inc.Inventor: Alfonso L. Baldi
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Patent number: 4815386Abstract: Pyrophoric preparations made of crushable open-celled metal skeleton such as honeycomb, metal foam or expanded twisted foil, filled with pyrophoric powder, so that when crushed to make a compact disc the metal skeleton is deformed and helps lock the powder particles in place.Type: GrantFiled: July 17, 1984Date of Patent: March 28, 1989Assignee: Alloy Surfaces Company, Inc.Inventors: David P. Dillard, Alfonso L. Baldi
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Patent number: 4799979Abstract: Heating or heat generation in general can be from activated aluminides of molybdenum, zirconium or other similar ignitible metals. Activation is by leaching out some of the aluminum and leaves a product which is highly pyrotechnic but not pyrophoric. Activation of such alloy renders activated surface porous so it car receive impregnants such as lubricants to thus act as a bearing. Pyrotechnic webs for use as decoys against heat-seeking missiles can be folded so that portions interfere with the free radiation of other portions, to thus extend the time the webs remain at high temperature. The folding also improves the trajectory through which the webs fall when discharged into the air. The web can be coated with a thin layer of powdered silica, alumina or zirconia to increase the proportion of its radiation in the 8 to 14 micron range.Type: GrantFiled: February 19, 1986Date of Patent: January 24, 1989Assignee: Alloy Surfaces Company, Inc.Inventor: Alfonso L. Baldi
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Patent number: 4708913Abstract: Metals like iron and nickel are pyrophorically activated by continuous or batch treatment. Activated metal can be coated with material that increases, or tempers by partial blocking, pyrophoric action. Pyrophoric powder can be compacted with ignitable powders or fibers to produce self-supporting bodies having different degrees of pyrophoric activity.Type: GrantFiled: July 8, 1981Date of Patent: November 24, 1987Assignee: Alloy Surfaces Company, Inc.Inventor: Alfonso L. Baldi
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Patent number: 4694036Abstract: Very good masking of pack diffusion aluminizing or chromizing on any metal to keep portions from being diffusion coated, is effected by localized coating the lowest layer of which is depletion-reducing masking powder the metal portion of which can have same composition as substrates, mixed with inert refractory diluent and non-contaminating film-former such as acrylic resin. The upper coating layer can be of non-contaminating particles like nickel or Cr.sub.2 O.sub.3 that upon aluminizing or chromizing become coherently held together to form a secure sheath. Such sheath can also be used for holding localized diffusion-coating layer in place. Film-former can be dissolved in volatile solvent, preferably methyl chloroform, in which masking powder or sheath-forming powder is suspended. Chromizing can be performed before aluminizing for greater effects. Aluminizing of metals like iron and nickel followed by leaching out much of the diffused-in aluminum, gives these substrates a pyrophoric and catalytic surface.Type: GrantFiled: June 23, 1983Date of Patent: September 15, 1987Assignee: Alloy Surfaces Company, Inc.Inventor: Alfonso L. Baldi
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Patent number: 4617202Abstract: Diffusion coatings can be masked from portions of a workpiece by combination of layers the outer one of which forms coherent strong shell that holds inner layer or layers in place. All ingredients of these layers can be materials such as nickel, nickel aluminide, chronium, chromic oxide (Cr.sub.2 O.sub.3) and inert diluent, that do not contaminate superalloys or even low alloy or plain carbon steels. Layer can be deposited from suspension in a solution of film-former like and acrylic resin in readily volatilizable solvent such as methyl chloroform or chloroform. Innermost layer can be depletion-preventing and can be omitted. Such a holding shell can also be used to retain on a workpiece surface a layer that causes formation of a diffusion coating. Chromizing can be performed before aluminizing. Low alloy steel conduit can be internally chromized and/or externally chromized or aluminized to make it more desirable for use as high pressure steam boiler heat exchange tubing.Type: GrantFiled: October 9, 1981Date of Patent: October 14, 1986Assignee: Alloy Surfaces Company, Inc.Inventor: Alfonso L. Baldi
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Patent number: 4615920Abstract: Workpieces are very rapidly pack diffusion coated by using an excess of energizers in the pack, heating the retort containing the packed workpieces at a rate that brings the workpieces to diffusion-coating temperature and then completing the diffusion coating, all in less than 50 minutes, then cooling the retort. Workpiece can have top coating layer of aluminum flake covered by a layer of extremely fine alumina or silica in a magnesium chromate binder, to provide surface having roughness at least about 10 micro-inches smoother than before the top coating. More active diffusion coated products are also produced.Type: GrantFiled: April 25, 1983Date of Patent: October 7, 1986Assignee: Alloy Surfaces Company, Inc.Inventor: Alfonso L. Baldi
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Patent number: 4537927Abstract: Diffusion coatings can be masked from portions of a workpiece by combination of layers the outer one of which forms coherent strong shell that holds inner layer or layers in place. All ingredients of these layers can be materials such as nickel, nickel aluminide, chromium, chromic oxide (Cr.sub.2 O.sub.3) and inert diluent, that do not contaminate superalloys or even low alloy or plain carbon steels. Layer can be deposited from suspension in a solution of film-former like an acrylic resin in readily volatilizable solvent such as methyl chloroform or chloroform. Innermost layer can be depletion-preventing and can be omitted. Such a holding shell can also be used to retain on a workpiece surface a layer that causes formation of a diffusion coating. Chromizing can be performed before aluminizing. Low alloy steel conduit can be internally chromized and/or externally chromized or aluminized to make it more desirable for use as high pressure steam boiler heat exchange tubing.Type: GrantFiled: January 17, 1984Date of Patent: August 27, 1985Assignee: Alloy Surfaces Company, Inc.Inventor: Alfonso L. Baldi
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Patent number: 4528215Abstract: In the pack diffusion coating of chromium into the surface of a superalloy, the formation of undesirable oxide inclusion is reduced when the diffusion coating pack contains at least about 3% Ni.sub.3 Al. Also the formation of alpha-chromium is reduced when the pack diffusion is carried out in a retort effectively not over five inches in height. On the other hand an alpha-chromium-rich layer at least 0.2 mil thick can be deliberately formed and the superalloy thus coated subjected to an aluminizing treatment to convert the alpha-chromium into islands that provide very high sulfidation resistance. Pack aluminizing in the presence of chromium makes a very effective aluminum- or chromium-containing top coating over platinum plated or platinum coated nickel-base superalloys. Depletion of diffusible material from workpieces heated in a powder-pack can also provide a surface on which aluminizing produces a highly impact-resistant coating.Type: GrantFiled: November 7, 1983Date of Patent: July 9, 1985Assignee: Alloy Surfaces Company, Inc.Inventors: Alfonso L. Baldi, Victor V. Damiano
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Patent number: 4467016Abstract: Low alloy steel tubing is decarburized, chromized and then aluminized with or without masking at the sites at which the tubing is to be welded in place, to greatly increase resistance of the tubing to high temperature oxidation and sulfidation. Low surface aluminum content after aluminizing makes it easier to weld at that surface.Type: GrantFiled: July 16, 1982Date of Patent: August 21, 1984Assignee: Alloy Surfaces Company, Inc.Inventor: Alfonso L. Baldi
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Patent number: 4464430Abstract: Very good masking of pack diffusion aluminizing on any metal to keep portions from being diffusion coated, is effected by localized coating the lowest layer of which is depletion-reducing masking powder that can have same composition as substrates, mixed with non-contaminating film-former such as acrylic resin. The upper coating layer can be of non-contaminating particles like nickel of Cr.sub.2 O.sub.3 that upon aluminizing or chromizing become coherently held together to form a secure sheath. Such sheath can also be used for holding localized diffusion-coating layer in place. Film-former can be dissolved in volatile solvent, preferably methyl chloroform, in which masking powder or sheath-forming powder is suspended. Chromizing can be performed before aluminizing for greater effects. Aluminized cases are stripped from superalloys by alternating dips in fluoride-containing and fluoride-free aqueous nitric acid.Type: GrantFiled: March 10, 1981Date of Patent: August 7, 1984Assignee: Alloy Surfaces Company, Inc.Inventor: Alfonso L. Baldi
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Patent number: 4443557Abstract: Pyrophorically activated metals are suitable catalysts for electrolyzing water and for other reactions in which nickel or platinum are catalysts. Pyrophoricity can be eliminated without destroying the catalytic effects. Protective coverings can protect and preserve the pyrophoricity. Raney type activation leaves a little aluminum in the activated metal and this aids in catalytic action.Type: GrantFiled: March 18, 1982Date of Patent: April 17, 1984Assignee: Alloy Surfaces Company, Inc.Inventor: Alfonso L. Baldi
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Patent number: 4435481Abstract: Pyrophorically activated surfaces of metal foil or screen, prepared by diffusing into surface a selectably removable second metal that is then selectively removed as by leaching, can be covered with reactive or inert materials. Reactive materials such as easily ignited metals or carbon or decomposable chemicals increase the heat generated by pyrophoric action. Inert materials slow down or prevent pyrophoric action. Pressure-sensitive adhesive tape in which the adhesive is of the non-transfer or transfer types can be adhered to pyrophorically activated surfaces to slow down action or to adhere material that reduces or increases severity of pyrophoric action. Pyrophoric Ni can be preserved for many months in alkaline solutions such as aqueous KOH, NaOH and triethanolamine. Pyrophoric Fe is prepared and preserved in aqueous alkaline stannite. Even better preservation is obtained for Ni and Fe with glycerine, ethylene glycol, triethanolamine and propylene oxide.Type: GrantFiled: July 28, 1980Date of Patent: March 6, 1984Assignee: Alloy Surfaces Company, Inc.Inventor: Alfonso L. Baldi